Governor



July 26, 1932.

J MILLER GOVERNOR Filed Nov. 6, 1929 IN VEN TOR. I Jaw/v M /7/4 5e.

A RNE Y.

, duced when the speed oi. rotation reachesa- Patented July 26, 1932 UNITED STATE PATENT OFFICE JOHN M. MILLER, OFNE'W YORK, N. Y., .ASSIGNOR TO OWENS DEVELOPMENT CORPO- RA'IflION, OF NEW YORK- N. Y.

I comma Application filed November cipal object of the invention beingto provide a'device of this character embodying a magnetic clutch and in which device the current supplied to said clutch is automatically repredetermined limit.

A further object of the invention is the pro-' vision, in combination with a magnetic clutch, of centrifugally operated means 'for varying the current supplied to said clutch.

Other objects and advantages of the in:-

vention will appear as the, description pro,- ceeds.

The drawing accompanying this specification is a longitudinal sectional view through a mechanism embodying the features of the present invention.

Referring to the drawing, 1 designates a shaft mounted for rotation in bearings 2 carried by standards 3 extending upward from a base plate 4. Keyed upon the shaft 1 at a point near one of itsbearings is an electrovmagnet 5, the housing of which is of cylindrical form and is provided with a pulley 6 for the reception of a belt '7 by means of which the rotation of the electromagnet may be transmitted to any desired mechanism. Mounted on Ejthe shaft, .between theelectromagnet 5 and the adjacent shaft bearing, is a pulley 8 of'a material capable of :being attracted by said magnet 5, said pulley being freely rotatable. and axially movable on the shaft and adapted to receive rotative motion by means of a belt 9 from any sultable source of power. The pulley 8 is maintained in such proximity to the electromagnetfi as to constitute' an armature which is attracted toward the electromagnet whenever the latter is ener-- gized, whereby the electromagnet and pulley will act as a clutch for transmitting motion from the belt 9 to the shaft 1 and the belt 7. Secured on-the shaft 1, at the endthereof, opposite from the pulley 8 is a pair ofradially extending arms or brackets 10,. in the outer forked end of each of which is pivoted a bell crank lever 11, one arm of which lies normally parallel with the shaft l and carries at-its free end a weight 12. The other arms 6, 1929.1 Serial No; 405,260.-

of the levers extend approximately Vradially of the shaft and are suitably connected'pivotally and carry a. contact finger 13 normounted on but insulated from the base plate. 1 i The spring finger 21 extends toward the shaft 1 and rests at its freelend on a contact plate 22 carried b an insulating disk 23 secured on the shaft. he coils of the electromagnet are connected at one end by a wire 24 to'the contact-plate 22 and at the opposite end by a wire 25 to that arm of the bell crank lever 11 carrying-the contact finger 13. It will thus be seen that as long as the contact finger 13 is in contact with the member 14 current will flow from the source- 19, through conductor 18, contacts 14,13 wire'25fi electromagv v net 5, wire 24, plate 22, spring nger 21 and conductor 20, back to the source, thus energizing the electromagnet and attracting the armature pulley' 8, whereupon rotation of the rotation of the shaft exceed a'certain predevtermined speed limit, however, the centrifugal motion of the brackets 10 will-cause the weighted arms ofthe bell crank levers 11 to swing outward in the direction of the arrow against the tension of the springs '16, thus carrying the contact finger 13: away from the contact member 14 and opening the circuit through the electromagnet. In order, however, that the current may not be completely engagement of the contacts 13, 14,'the current will flow from conductor '18, throu h pulley will cause rotation of the electromagnet therebytransmitting the motion of the.

belt 9 to'tlre' belt 7 and shaft 1. Should the -05 cut ofi', a resistance element 26 is' shunted across the wires 18 and 25, so that upon dis-- resistance 26 and wire 25, and thence over t e loo rest of the circuit above described, back to the source, thus cutting down the amount of current to the electromagnet and thereby them. The speed v permitting J electromagnet through the regular circuit.

' tends to maintain the constant speed. It will, of course, be under means for supplying current to sal and maintained in contact wi It will therefore be obvious that the device serves to compensate for variations in load which the element 5 is required 'to carry and driven mechanism at a stood that the voltage of the circuit will be regulated to correspond with the load to be driven. a v

I claim: v 1.- A magnetic speed control mechanism, comprising a pulley armature mounted for rotation, an electromagnet' mounted for rotation in proximity to said pulley and adapted to attract the same and to form therewith a motion transmitting clutch, means for supplying current to'said electromagnet and including a normally closed main circuit and a shunt circuit, a resistance shunt circuit, and means rotatable with said electromagnct for automatically opening said main circuit and causing the current to flow through said shunt clrcuit thereby to reduce the current supply to the electromagnet when .the rotation thereof has reached a prede- .termined'speed.

2; A magnetic. s comprising a shaf mounted for rotation, a pulley the current to eed control mechanism,

armature mounted (on the shaft for fixed contact member, and centrifugal means associated with said movable member for automatically moving the same out of contact with the fixed memberwhen the rotation of the shaft has reached a predetermined speed.

4. A magnetic speed control mechanism, comprising a shaft mounted for rotation, a magnetic clutch mounted on said shaft, one

member of said clutch being secured to the shaft for rotation therewith, a normally closed main circuit for supplying current to said clutch and including a fixed contact contact member carried member, a movable by said shaft and maintained in contact with said fixed contact member, a resista'n ce element shuntedacross said main circuit, and

centrifugal means associated with said movable member for automatically moving the samexout of contact'with the Tfixed" member thereby toopen said main circuit and cause flow through said resistance element'when the rotation of the shaft has reached apredetermined speed. In testimony whereof, I aflix my si ature.

4 JOHN M. MIL ER.

element in said rotation relative thereto, an electromagnet' secured on said shaft for rotation therewith and ada ted to-attract said pulleygand form therewit a motion transmittin clutch,

magnet and including a normally closed-main circuit and a shunt circuit, a resistance element in said shunt circuit, and centrifugal means carried by said shaft and adapted automatically to open said main circuit and to flow through said shunt causing the current circuit thereby to reduce the current supply to the electromagnet when the rotation has reached a predetermined speed.

3. A magnetic speed control mechanism, comprising a shaft mounted for rotation, a

' magnetic clutch mounted on said shaft, one

member of said clutch being secured to the shaft for rotation therewith, a normally closed circuit for supplyin current to said clutch and including-a fixe contact member a movable contact member carried b said III-id electro- 

